National Gateway is a multi-stage railroad construction project in the United States promoted by CSX Transportation, a unit of CSX Corporation. It is designed to improve rail connections between ports in the U.S. mid-Atlantic seaboard and the Midwest by upgrading bridges and tunnels to allow taller freight trains (ones carrying double-stack intermodal containers). In 2008 the company announced its plans to invest $300 million, and is seeking investment from state governments and the U.S. federal government of an additional $400 million as a public-private partnership. Phase 1 of the $850 million project, between CSX’s existing terminal in Chambersburg, Pennsylvania, and its hub facility in Northwest Ohio. was completed in September 2013.
An unrelated project with the same name was founded in 2001 as an engineering test between global communication networks.
Completed railway improvement projects
- Northwest Ohio Intermodal Terminal in North Baltimore, Ohio. Funded completely by CSX. Opened February 2011. A number of tunnels were open cut for the project including:
- Virginia Avenue Tunnel in Washington, DC (2018). Tunnel rebuilt using cut-and-cover to double track and allow for double stacked containers.
Projects under construction or funded
- Rail corridor parallel to Interstate 70 and Interstate 76 between Washington, D.C. and northwest Ohio, via Pittsburgh. Federal funding approved in December 2010.
- Expanding the Virginia Avenue Tunnel in Washington. In 2011 CSX decided to completely fund this project.
- Lowering track on the Capital Subdivision in Maryland.
- Replacing bridges and modifying tunnels on the Metropolitan Subdivision in Maryland.
- Rail corridor parallel to Interstate 95 between North Carolina and Baltimore, via Washington, D.C.
- Washington, D.C. - Ohio rail corridor
- Carolina Corridor between Wilmington and Charlotte
- National Docks Secondary and Long Dock Tunnel
- List of CSX Transportation lines
- Heartland Corridor – Norfolk Southern Railway improvement project
- Norfolk Southern Crescent Corridor
- Virginia Port Authority
- Transportation Investment Generating Economic Recovery, a stimulus program providing some of the funding
- MidAmerica Corridor 
- CSX Corporation, Jacksonville, FL (2008). "CSX Announces National Gateway to Improve Flow of Freight." Archived 2010-11-20 at the Wayback Machine 2008-05-01.
- National Gateway (Communications)
- TradingMarkets.com (2010-09-19). "Loaded for Business."
- Akron Railroad Club (2011-06-30)."CSX Shows Off North Baltimore Container Facility."
- ProgressiveRairoading.com (2010-12-17). "USDOT, Ohio finalize TIGER grant pact for National Gateway corridor."
- CSX (2011-05-18). "CSX Commits Additional $160 Million to National Gateway." Press release.
- "CSX initiative will include new intermodal terminals". Jacksonville Business Journal. May 2, 2008. Retrieved 2008-05-17.
- Berman, Jeff (May 12, 2008). "Transportation infrastructure: CSX launches National Gateway. Rail carrier says $700 million PPP will provide efficient transportation link between Mid-Atlantic ports and Midwest". Logistics Management. Archived from the original on May 21, 2008. Retrieved 2008-05-17.
- Burns, Adrian (May 2, 2008). "CSX commits to new south-side intermodal facility". Business First of Columbus, Ohio. Retrieved 2008-05-17.
- Maryland Department of Transportation, Hanover, MD (2008). "Maryland Freight Project List - Rail." Accessed 2009-12-05.
- Metropolitan Washington Council of Governments, Washington, DC (2009). "CSX National Gateway Projects in the Washington Region." Accessed 2009-12-05.